Paper-cutting machine



Aug. 12, 1924. 1,504,521

0. SEYVBOLD PAPER CUTTING MACHINE Filed 001:. 20, 1920 4 Sheets-Sheet lINVENTOR. (Mews 5: 7.5

ATTORNEYJ Aug. 12 1924. 1,504,521

- C. SEYBOLD PAPER CUTT ING MACHINE Filed 20. 1920 4 Sheets-Sheet 2INVENTOR. [M2155 557.5040.

' ATTORNEYJ C. SEYBOLD PAPER CUTTING MACHINE Filed Oct. 20, 1920 4Sheets-Sheet 3 INVENTOR.

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A TTORNEYJ Aug. 12-. 1924. 1,504,521

C. SEYBOLD PAPER CUTTING MACHINE Filed Oct. 20, 1920 4 Sheets-Sheet 4ATTORNEYS Patented Aug 12, 1924,

CHARLES SEYBOLD, 0F DAYTON, OHIO.

UNITED STATES PAPER-CUTTING MACHINE.

Application-filed October 20, 1920. Serial No. 418,205.

Montgomery and State of Ohio, have in;

vented certain new and useful Improvements in Paper-Cutting Machines, ofwhich. the following is a full, clear, and exact description, referencebeing had to the drawings forming part of thisspecificat-ion.

My invention relates to machines for cutting and trimming bundles orpiles of paper and has particularly to do with improvements of theclamping mechanism in which the piles of paper are held with increasingfrictional pressure as the cutting knife is drawn through the pile.

Heretofore, so far as I am aware, it has been customary to operate theclamp by a friction clutch interposed between the clamp pulling bars andthe driving power so that the clamp will compress the pile within thefixed limits of the friction clutch which is designed to slip when themaximum pressure has been attained.

The quality of the paper stock dulls the knife and the time consumed toremove a dull knife for sharpening is an element of considerable momentin the working capac ity of the machine, so that knives are apt to bekept in use until they can be no longer forced through the bundle ofpaper stock. It becomes of importance, therefore, in some cases toprovide friction mechanism for the clamp which shall not be limited toany fixed amount but which shall automatically increase as the need forholding the pile increases during the cutting operationI A. dull knifeitself acts as a clamp until it begins to cut so that the need for thecompression of the pile increases as the knife passes through the paperstock.

It is-the object of my invention topro vide for this desired increase ofthe clamp pressure by increasing-the speed of rotation of the clutchmember in the manner and with the mechanism to be hereinafterparticularly pointed out and claimed whereby the friction clutchelements are caused to travel with increased speed as the knife proceedswith its work.

In the drawings,

Figure 1 is a front elevation of one form of paper cutting machine withmy improvements applied thereto;

Figure 2 is a front elevation of the invention in detail showing theworking parts.

Figure 3 is a rear elevation of the sa'me.

Figure 4 is a cross section taken on the lines 4.& of Figure 2 lookingin the direction of the arrow. p p} Figure 5 is a diagrammatic end viewof the clamp.

The general construction of one form of paper cutter to which myinvention is applied comprises the ordinary operating parts mounted in asolid substantial frame-work 1 with cutting table 2 and side standards3, 3 for holding and guiding the knife carrier ft and clamp 53. Theknife carrier carrying the cutting knife '6 is actuated in the usual wayby the pulling bars 7 7 coupled to the main driving shaft 8 ofthemachine which is rotated by the driving pulley 9.

The paper clamp 5 is provided with side pulling arms which are coupledto a rock shaftlO mounted in suitable bearings transversely of themachine so that with the rocking of this shaft the clamp is brought downupon the pile of paper to be out. The rock shaft is actuated byconnection with the knife driving shaft of the machine in the ordinaryconstruction and a friction clutch connection provided between thisdriving shaft and the clamp rock shaft, so that the paper pile will beheld during the cutting operation under the fixed tension of thisfriction clutch. This is'the ordinary construction and it is to improveupon this construction that my invention is directed. The other detailsof construction of the paper cutter are not of importance and so far asshown are for illustrative purposes only.

In Figures 2, 3 and 4 I have shown the novel features of my presentinvention comprising the mechanism for frictionally connecting the knifedrive shaft with the rock shaft for the clamp to obtain automaticallyincreasing pressure of the clamp as the knife proceeds with its work.

Keyed to the drive shaft 8 is an eccentric 12 carrying the eccentricstrap 13 which is split as usual for mounting and the halves heldtogether by the clamp bolts 14, 14.

Formed on the eccentric strap is a boss 15 into which is screwed a linkarm 16, the outer end of which is pivoted at 17 to a rocker arm 18 whichis loosely mounted on the rock shaft 10. The link arm 16 is pivoted tothe rocker arm about mid-way of its 7 a which bear upon the disks"31.

' loosely journaled on the hollow shaft 19 are a pair of pinions 23, 23,which engage the segment gears on the roek shaft 10, while keyed Itothehollowishaft 19 between the pinions isa ratchetwheel '24 whichisehgaged-by a pawl 25 pivoted at 26 to the rocker arm 18 and whichprevents the ratchet fromfany back movement while permitting'freemovement in the opposite direction. The-pawl is held in engagement withthe ratchet by the spring 27 mounted in the housing '28. Keyed to thehollow shaft 19 are friction clutch member's'29 having six cup shapedrecesses for the reception of coiled springs 30, the outer ends of whichare secured to the disks 31, also keyed on the hollow shaft. The clutchmembers are thus held by these springs in frictional engagenientwitlithe leather disk washers 32 carried by the side faces of the looselymounted pinions and any desired frictional tension may be. obtained bytightenlng the nuts 21 7 being obtained, "the hollow shaft '19 is ex-'on the screw threaded ends of the rod 20 In order to preventitoo great atension tended a slight distance beyond the tension members 29 so as toform a shoulder 33 at each end and prevent tightening up the disks 31beyond a xed point.. It will be under stood from the foregoing that thepinions 23, 23'are' thus frictionally secured to the hollow shaft'andthe ratchet wheel but that the pinionswhich are in engagement withthesegment. gears 22 can slip under the tension of the clutch members asthe rockerarm 18 is carried its full stroke under the action of theeccentric' 12 on thedriving shaftr8.

The segment gear 22 is provided. with a lug. 34 which normally lies inengagement With a corresponding lug 35 on therocker arm 18 and as thesegment gears 22 are keyed to.the rockshaft 10 and this rock shaftis'coupled to the pulling arms of the .clainp as the rocker armris swungby the eccentric the teeth .of the pinions 23 carry 1 thesegment gearsby pushlng on them and thu'srock the shaft 10 and bring the clamp do wrrl to thepaper pile. As soon as the clamp; meets the pile and is stoppedin its downwardmovement the tension between the pinions 23 and thehollow shaft 19 is exerted to compress the paper pile. As soon asthelimit oftension isrreached inasmuch as the ratchet can not rotate beingheld by thepawl 25, the pmions begin to rotate,

maintaining. the' compression and the lugs 6 34' and 35 separate, therocker armcontinuthe frictional tension is applied a frictional tensionof 1000 pounds will give a compression of 2000 pounds. On the returnstroke of the rocker arm the ratchet is released by the pawl and theratchet, hollow shaft and pinions rotate back to normal, the lug 35 onthe rocker arm picks up the lug 34 on the segment gear and the rockshaft 10 is rocked back to its normal position lifting the clamp to itsraised position and releasing the paper pile. \Vhile the friction clutchremains constant the actuation of the rocker arm by the eccentric causesthe rocker arm to increase its speed to the middle of its stroke andthen gradually to decrease. This increase of speed proportionallyincreases the clutch pressure as the knife enters the paper pile andtherefore the compression exerted by the clamp increases as the knifeenters the pile.

To prevent any overthrow of the rock shaft in lifting the clamp Iprovide a band brake36 engaging a pulley on the rock shaft 10 which isregulated by spring tension bolt 37 Having thus described my invention,what I claim as new and desire to secure by Letters Patent, is 1- 1. Ina paper cutter, the combination with the knife driving mechanism and arock shaft for actuating the clamp, of means for rocking the shaftcomprising a member fixed thereto and a member loosely mounted thereonin engagement therewith, a friction clutch for the loosely mountedmember and means for actuating said member to rock the clamp actuatingshaft and actuate the clamp in both directions.

2. In a paper cutter, the combination with the knife driving mechanismand a rock shaft for actuating the clamp, of means for rocking the shaftcomprising a member fixed thereto and a member loosely mounted thereonin engagement therewith, a friction clutch for the loosely mountedmember and an cecentric for swingin the loosely mounted memberpositively in both directions to bring the clutch into action and toactuate the clamp in both directions.

3. In a paper cutter, the combination with the knife driving mechanismand a rock shaft for actuating the clamp, of means for rocking the shaftcomprising a segment gear fixed thereto and a rocker arm loosely mountedthereon, a pinion mounted on the rocker arm in engagement with thesegment gear with a friction clutch interposed between the pinion andgear and means for swinging the rocker arm to bring the clutch intoaction and to actuate the clamp in both directions.

4, In a paper cutter, the combination with the knife driving mechanismand a rock shaft for actuating the clamp, of means for rocking the shaftcomprising a segment gear fixed thereto and a rocker arm loosely mounted thereon, a pinion mounted on the rocker arm in engagement with thesegment gear with a friction clutch interposed between the pinion andgear and an eccentric for swinging the rocker arm its full stroke toincrease the clutch action.

5. In a paper cutter the combination with a driving shaft for the knifeand a rock shaft for the clamp, of a segment gear keyed to the rockshaft, a rocker arm loosely mounted on the rock shaft, a pinion mountedon the rocker arm in engagement with the segment gear, means fornormally locking the gear from rotating and a friction clutch interposedbetween the pinion and the locking means, with means for actuating therocker arm its full stroke under the tension of the clutch when theclamp reaches the paper pile.

6. In a paper cutter the combination with a driving shaft for the knifeand a rock shaft for'the clamp, of a segment gear keyed to the rockshaft, a rocker arm loosely mounted on the rock shaft, a pinion mountedon the rocker arm in engagement with the segment gear, a pawl andratchet for normally look ing the gear from rotating and a frictionclutch interposed between the pinion and the ratchet with an eccentricfor actuating the rocker arm its full stroke under the tension of theclutch when the clamp reaches the paper.

7. In a paper cutter the combination with a driving shaft for the knifeand a rock shaft for the clamp, of a segment gear keyed to the rockshaft, a rocker arm loosely mounted on the rock shaft, a pinion inengagement with the segment gear, a hollow shaft journaled in the rockerarm upon which said pinion is loosely mounted, a ratchet keyed to thehollow shaft with pawl on the rocker arm to lock same from movement inone direction and friction clutch members intermediate the pinion andthe hollow shaft, an eccentric on the knife driving shaft and linkconnection therefor, with the rocker arm whereby the swinging of therocker arm will cause said pinion to rock the clamp rock shaft under thetension of the friction clutch.

CHARLES SEYBOLD.

